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Unverified Commit 14323ff8 authored by John Hsu's avatar John Hsu Committed by Mark Brown
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ASoC: nau8540: PGA short to ground 



Change channel PGA input mode selection for better recording quality.
The patch shorts the inputs to ground with 12kOhm differentially
terminated.

Signed-off-by: default avatarJohn Hsu <KCHSU0@nuvoton.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent e4d0db60

sound/soc/codecs/nau8540.c

+7 −0
Original line number Diff line number Diff line
@@ -730,6 +730,13 @@ static void nau8540_init_regs(struct nau8540 *nau8540) 
	regmap_update_bits(regmap, NAU8540_REG_ADC_SAMPLE_RATE,

		NAU8540_CH_SYNC | NAU8540_ADC_OSR_MASK,

		NAU8540_CH_SYNC | NAU8540_ADC_OSR_64);

	/* PGA input mode selection */

	regmap_update_bits(regmap, NAU8540_REG_FEPGA1,

		NAU8540_FEPGA1_MODCH2_SHT | NAU8540_FEPGA1_MODCH1_SHT,

		NAU8540_FEPGA1_MODCH2_SHT | NAU8540_FEPGA1_MODCH1_SHT);

	regmap_update_bits(regmap, NAU8540_REG_FEPGA2,

		NAU8540_FEPGA2_MODCH4_SHT | NAU8540_FEPGA2_MODCH3_SHT,

		NAU8540_FEPGA2_MODCH4_SHT | NAU8540_FEPGA2_MODCH3_SHT);

}



static int __maybe_unused nau8540_suspend(struct snd_soc_codec *codec)

sound/soc/codecs/nau8540.h

+12 −0
Original line number Diff line number Diff line
@@ -184,6 +184,18 @@ 
#define NAU8540_PRECHARGE_DIS		(0x1 << 13)

#define NAU8540_GLOBAL_BIAS_EN	(0x1 << 12)



/* FEPGA1 (0x69) */

#define NAU8540_FEPGA1_MODCH2_SHT_SFT	7

#define NAU8540_FEPGA1_MODCH2_SHT	(0x1 << NAU8540_FEPGA1_MODCH2_SHT_SFT)

#define NAU8540_FEPGA1_MODCH1_SHT_SFT	3

#define NAU8540_FEPGA1_MODCH1_SHT	(0x1 << NAU8540_FEPGA1_MODCH1_SHT_SFT)



/* FEPGA2 (0x6A) */

#define NAU8540_FEPGA2_MODCH4_SHT_SFT	7

#define NAU8540_FEPGA2_MODCH4_SHT	(0x1 << NAU8540_FEPGA2_MODCH4_SHT_SFT)

#define NAU8540_FEPGA2_MODCH3_SHT_SFT	3

#define NAU8540_FEPGA2_MODCH3_SHT	(0x1 << NAU8540_FEPGA2_MODCH3_SHT_SFT)





/* System Clock Source */

enum {